docs: add REST API job lifecycle cookbook

[DanielLeens]

Purpose

Practical operational guide for managing the full SeaTunnel Zeta REST API job lifecycle, complementing the existing REST API reference docs.

Changes

• Added docs/en/engines/zeta/rest-api-job-lifecycle.md (EN)
• Added docs/zh/engines/zeta/rest-api-job-lifecycle.md (ZH)
• Updated docs/sidebars.js to include the new page inside the REST API category

Coverage

• Job submission via JSON body (single job, multi-transform examples)
• Status query: running-job, running-jobs, finished-job, metrics endpoints
• Log query endpoint
• Stop / cancel / stop-with-savepoint semantics comparison table
• Job recovery: restart from latest checkpoint or specified savepoint
• Authentication: basic auth and bearer token examples
• Performance considerations (finished-job accumulation, concurrent submission throttling, dynamic port discovery)
• Common errors and troubleshooting table

Closes #10979 (P0-3)

[davidzollo]

CI Fix: Replace deprecated field names

The Code style CI check is failing because AllFileSpecificationCheckTest forbids source_table_name and result_table_name anywhere in the repo. These were replaced by plugin_input / plugin_output in a previous migration.

Files affected:

• docs/en/engines/zeta/rest-api-job-lifecycle.md
• docs/zh/engines/zeta/rest-api-job-lifecycle.md

Fix (16 occurrences, both files):

s/"result_table_name"/"plugin_output"/g
s/"source_table_name"/"plugin_input"/g

The fix commit is available at: https://github.com/davidzollo/seatunnel/tree/fix/pr-10983-ci-fix

You can apply it with:

git fetch https://github.com/davidzollo/seatunnel fix/pr-10983-ci-fix
git cherry-pick FETCH_HEAD